Cascading-synchronous mixer and method of operation

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Reexamination Certificate

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C455S209000, C455S324000

Reexamination Certificate

active

06876844

ABSTRACT:
A radio frequency (RF) demodulation circuit comprising: 1) a radio frequency (RF) mixer having a first input port capable of receiving an incoming RF signal having a frequency of RF and a second input port capable of receiving a first local oscillator (LO) signal having a frequency of LO, wherein the RF mixer generates a first intermediate frequency (IF) signal having a frequency of IF; 2) a frequency divider circuit capable of receiving the first LO signal having the frequency of LO and generating therefrom a second local oscillator (LO) signal having a frequency of LO/N and synchronized with the first LO signal; and 3) an intermediate frequency (IF) mixer having a first input port capable of receiving the first IF signal and a second input port capable of receiving the second LO signal having the frequency of LO/N, and wherein the IF mixer generates a baseband output signal.

REFERENCES:
patent: 20010015995 (2001-08-01), Emery et al.
patent: 20010024450 (2001-09-01), Takato et al.
U.S. Appl. No. 2004 (Sindhushayana et al.), filed May 2004.

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